27"er Light Wide Rim's

Hi all are there any Light wide 650B rim's?

I have find that 650B are good for one thing and that is Muni(Mountain Unicycle's) I'm looking to build up a Light 27"er (650B)!
I have in the past designed and build a nice 26" Ti framed Muni with a Two Speed Hub but i'm looking to have more fun riding a Light Muni..